By which I mean will it ever actually see print now that the license will 'go away' before it was scheduled to be released as a physical product? That's the single most interesting book in the line to me and will greatly influence whether or not I take the plunge and buy the rest of the WWC: CW.

As I understand it from talking with Dom at Dragonmeet there were two attempts to get the final campaign piece written by separate (sequential) teams of authors. In both cases they failed to deliver a publishable manuscript in time as C7 knew earlier this year that they were not going to renew the licence with Chaosium.

Our American Cousins is out in pdf (or coming in hard copy maybe) for backers. If you were not a backer then no it's never going to be in print unless someone sells their backer copy (assuming it comes out in hard copy)

Speculation follows
There is no chance that anyone else is likely to pick up a licence and the setting (which is C7's IP in so far as you can apply IP to the Cold War).

There might be an opportunity for C7 to continue publishing material in the WWC setting when they have their new D100 system in place.

Has there been any indications that C7 will be developing their own d100 system as opposed to developing some totally different rule system?

I've just ordered the core setting book, then visited the forum where I leant they are going their separate ways to Chaosium. So I'm hoping that any future books will be compatible, even if there is a minimal degree of converting, with the current books and ones from other publishers.